Virial coefficients for the square-well potential

The aim of the present work is to derive exact expressions for the second and third virial coefficients B/(T) and C(T) for fluids of molecules interacting according to the square-well potential of arbitrary well width and arbitrary dimensionality d. General expressions for the terms of the fourth virial coefficient D(T), where D(T)=D 1 (T)+D 2 (T)+D 3 (T) are obtained when the width of the attractive well is equal to the radius of the hard sphere. For d=3 and 1, the values of D 1 , D 2 are analytically obtained, whereas D 3 is computed numerically.